Three‐Year Outcomes and Latent Class Trajectory Analysis of the Childhood Arthritis and Rheumatology Research Alliance Polyarticular <scp>JIA</scp> Consensus Treatment Plans Study

EC was superior to SU across three years for outcomes reflecting time spent in lower disease activity. Starting bDMARD within two months predicted rapid improvement and maintenance of inactive disease. These results support the hypothesis that early bDMARD initiation reduces overall disease burden in pJIA.